Description
Brilliant white, fine talc for making grounds, paint and pastels. Our talc is dry ground from natural ores in Montana. Use as an additive to make grounds and for adding texture and body to paints. Add to oil colors and mediums to create textural and bodying qualities to oil paint without affecting the color. Chalk has little color in drying oil, so it can be added to oil paint without affecting the tint of the color.
| Properties | |
| Chemical Name | Magnesium Silicate |
| A fine dry ground talc with a closely-controlled particle size distribution. | |
| Source | Montana |
| Chemical Analysis | |
| Silicon Dioxide (SiO2) | 61% |
| Magnesium Oxide (MgO) | 31% |
| Calcium Oxide (CaO) | <0.5% |
| Aluminum Oxide (Al2O3) | 1% |
| Iron Oxide (Fe2O3) | <1.3% |
| Moisture Loss @110º C. | <0.5% |
| Loss on Ignition | 5.5% |
| Typical Physical Properties | |
| Median Particle Size (microns) | 3 microns |
| Hegman Fineness (minimum) | 5 |
| Dry Brightness (Hunter Y, Rd Value) | 87 |
| Retained on 325 Mesh Screen | – |
| Oil Absorption | 34 g oil / 100 g pigment |
| Bulk Density (Loose) | 0.26 g/cc (16.0 lbs./ft3) |
| Tap Density (Packed) | 0.56 g/cc (34.7 lbs./ft3) |
| Bulking Value (Weight/Solid gallons, lbs.) | 23.3 |
| Specific Gravity | 2.8 |
| pH | 8.8 |
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